Garage Door Chain Sprocket Broke

Over time the sprocket s teeth can wear and the chain may jump or skip when the opener raises the door.

Garage door chain sprocket broke.

The most common cause of a chain being loose and appearing broken is a broken gear and sprocket. Chain driven garage door openers should have some slack in the chain for optimal performance. This diy repair guide explains how to replace the gear and sprocket assembly on a chain drive garage door opener. One of the most common repairs on a liftmaster garage door opener is a broken gear sprocket.

The gear and sprocket assembly is inside the cover of the garage door opener motor. Over time though this slack can increase or the gear and sprocket assembly can wear and the chain may pop off the sprockets. Liftmaster and chamberlain garage door openers are very common for this. This is a video on how to change the gear sprockets in a craftsman garage door opener.

Chain drive garage door openers have a sprocket that is attached at the top of the motor. Your garage door opener has a gear and sprocket that will eventually fail. This was a craftsman model 139 53976srt. You can put the chain back on your automatic garage door opener using a simple adjustment mechanism.

After several years the garage door springs become weaker causing more stress on this particular part causing it to fail and wear out. This can be easily replaced by a garage door service technician. Documenting how i repaired the garage door. I am not a professional.

The chain got loose and popped off the gear.